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Posted: 4/22/2015 9:26:45 PM EDT
[#1]
Can you post a pic of your belled case?
 Should look like this. Left, sized case. Center, belled. Right, bullet sitting on belled case. If you need help posting pics, look in FAQ's for instructions. |
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Posted: 4/22/2015 9:29:33 PM EDT
[#2]
Seat and crimp in separate operations.
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Posted: 4/22/2015 9:30:26 PM EDT
[#3]
That's exactly what my FMJ bullets look like. I've not had issues with any straight walled pistol ammo I've reloaded (like you've pictured), but these little necked Nambu 8mm cases are very thin and when I seat the bullet, it partially collapses the neck.
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Posted: 4/22/2015 9:31:55 PM EDT
[#4]
Quote HistoryQuoted:
Seat and crimp in separate operations. I'm not crimping (and this seating die doesn't appear to have a taper crimp feature.. I'll try raising the die body so that the case isn't fully seated in the die. |
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Posted: 4/22/2015 10:46:19 PM EDT
[#5]
I have has to lube the inside of the case mouth on a few similar calibers before. It might be worth a shot of you apply a light crimp afterwards.
I have also found that the brand of brass makes a big difference, but you don't have many options in 8mm Nambu beyond forming from 6.8 SPC. |
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Posted: 4/22/2015 11:07:08 PM EDT
[#6]
Quote HistoryQuoted:
I have has to lube the inside of the case mouth on a few similar calibers before. It might be worth a shot of you apply a light crimp afterwards. I have also found that the brand of brass makes a big difference, but you don't have many options in 8mm Nambu beyond forming from 6.8 SPC. Yes... I am using Huntington's 8mm Nambu cases. I will try putting a little Imperial Wax on the inside of the necks before seating. I'll have to explore my options for crimping this particular cartridge. Like I mentioned... my CH4D seating die doesn't appear to have a crimp feature. I've just written CH4D to see if my dies have a roll crimp feature |
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Posted: 4/23/2015 11:13:45 AM EDT
[#7]
Your die is adjusted too far down and is contacting the shell case before the seater plug seats the bullet to the correct depth. Raise your die a little and reset the seating depth.
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Posted: 4/23/2015 12:39:34 PM EDT
[#8]
What is the measured diameter of your bullets and the inside case neck diameter?
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Posted: 4/25/2015 11:07:15 AM EDT
[#9]
On my little bottleneck cases (25-20 and 30Mauser), I use a Lyman M die to expand the necks for cast boolits, and seating is done before crimping. In this manner mangled brass is a thing of the past.
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Posted: 4/25/2015 1:19:29 PM EDT
[#10]
Quote HistoryQuoted:
Your die is adjusted too far down and is contacting the shell case before the seater plug seats the bullet to the correct depth. Raise your die a little and reset the seating depth. This is my thought also. |
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Posted: 4/29/2015 10:28:07 AM EDT
[#11]
Thanks guys... I raised the seating die a bit (and also confirmed with CH4D that this 8mm die does have a crimp feature). When I raised the seating die, the collapsed neck problems were eliminated.
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Posted: 4/29/2015 2:00:41 PM EDT
[#12]
Good to hear.
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Posted: 5/3/2015 12:05:24 PM EDT
[#13]
What brass are you using? I am workng on a friends Nambu and am trying to source either loaded ammo or brass cases. In my Nambu thread in gd, a poster mentioned forming 357 sig brass.
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Posted: 5/3/2015 2:51:52 PM EDT
[#14]
Quote HistoryQuoted:
Your die is adjusted too far down and is contacting the shell case before the seater plug seats the bullet to the correct depth. Raise your die a little and reset the seating depth. This was my first thoughts as well Good luck you'll figure it out |
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